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Distribution of beta-1 integrin in the developing rat heart
W Carver, RL Price, DS Raso, L Terracio and TK Borg
Department of Developmental Biology and Anatomy, University of South Carolina School of Medicine, Columbia 29208.
Cell-cell and cell-matrix interactions play critical roles in various developmental processes including differentiation, proliferation, and migration. Members of the integrin family of cell surface components are important mediators of these cell-extracellular matrix (ECM) contacts or interactions. The ECM provides signals to individual cells essential for development and differentiation and plays essential roles in establishing and maintaining the complex structure of the vertebrate heart. Integrins provide a fundamental link for transduction of developmental signals to cells. Integrin expression by cardiac myocytes is altered during neonatal heart development and disease; however, little is known regarding the spatial and temporal patterns of integrin expression during embryonic and fetal heart development. Essential to understanding the role of integrins in the organization of the heart, the present studies have localized beta-1 integrin protein and mRNA in fetal and neonatal rat hearts. Beta-1 integrin is predominantly found in regions of remodeling (trabeculae) in the early heart (10-13 days of gestation). Later in development (15 days of gestation onward), beta-1 integrin is abundant in regions containing an elaborate ECM, such as the valves. These studies further support the hypothesis that the expressions of integrins and ECM are coordinately regulated in the developing heart.
Volume 42,
Issue 2,
pp. 167-175,
02/01/1994
Copyright © 1994 by The Histochemical Society
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